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Challenge object: Tiny faint galaxy grouping in Ursa Major
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Roland Christen
Wanted to see how faint I could go here at my light polluted industrial park. Local amateurs pointed out a tiny grouping of faint galaxies that they haven't been able to get much info on them or any detailed images. I tried with my 130EDF, 10" F8 Mak-Cass and finally with my 17" F8 Astrograph. Main limitation is the amount of background sky brightness here due to severe light pollution, but I'm always up to a challenge. The galaxies showed up in a wide field image in my 130GTX as a tiny little group, showed some small amount of detail in the 10", but it took the 17" to finally reveal some better detail.
Star resolution last night was 1.5 arc sec FWHM and guiding was under 0.2 arc sec FWHM for the 20 minute exposures. Had some horrific satellite trails that had to be removed, otherwise everything went fairly smoothly.
https://www.astrobin.com/ynxjhk/0/
I had one satellite trail that resembled a corkscrew, never have I seen anything like that. See below.
 -- Roland Christen Astro-Physics
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Steve Armen
That is nice sensitivity with the big Cassegrain.
Never have seen a satellite look like that. Another great target for the big 17" Cass would be Andromeda's Parachute - gravitationally lensed quasar. Not the right time of year just yet. In June in your area will be up late ~ 2am. I've goofed around attempting to image it with my idk10 silly, not enough focal length or mirror. RA: 1 : 47 : 9.53 DEC: 46 : 30 : 35
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wow that is some crazy specs there Roland Scope focal length 3454mm Image scale 0.322 arc sec per pixel Individual 1200 sec resolution 1.5 arc sec FWHM Guiding accuracy 0.18 arc sec rms Seeing: 3/5 - Clear Sky Clock
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Brent Boshart
If you can tell me the time (start and end) of the the corkscrew satellite sub, I may be able to identify it.
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Roland Christen
Sounds like a challenging object. maybe have to ask one of my astronomer friends in Hawaii if I could use the 20" University Hawaii scope on Mauna Loa next time I'm up there.
Rolando
-----Original Message-----
From: Steve Armen <st5.armen@...> To: main@ap-gto.groups.io Sent: Wed, Apr 27, 2022 10:17 pm Subject: Re: [ap-gto] Challenge object: Tiny faint galaxy grouping in Ursa Major That is nice sensitivity with the big Cassegrain.
Never have seen a satellite look like that. Another great target for the big 17" Cass would be Andromeda's Parachute - gravitationally lensed quasar. Not the right time of year just yet. In June in your area will be up late ~ 2am. I've goofed around attempting to image it with my idk10 silly, not enough focal length or mirror. RA: 1 : 47 : 9.53 DEC: 46 : 30 : 35 -- Roland Christen Astro-Physics
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Roland Christen
That particular image was started 04:24:18 hh:mm:ss Universal time, ended 600 sec later.
Rolando
-----Original Message-----
From: Brent Boshart <bboshart@...> To: main@ap-gto.groups.io Sent: Wed, Apr 27, 2022 11:19 pm Subject: Re: [ap-gto] Challenge object: Tiny faint galaxy grouping in Ursa Major If you can tell me the time (start and end) of the the corkscrew satellite sub, I may be able to identify it.
-- Roland Christen Astro-Physics
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Brent Boshart
I could not identify a satellite going through your FOV at that time. There was a StarLink near the end but it was eclipsed. As others mentioned, it maybe was an aircraft. This is from a database of over 5,000 but there are lots of classified satellites not in the database.
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